| 1. 难度：中等 | |
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_______online shopping has changed our life , not all of its effects have been positive. A. Since B. After C. While D. Unless
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| 2. 难度：中等 | |
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He is a shy man,___he is not afraid of anything or anyone. A. so B. but C. or D. as
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| 3. 难度：中等 | |
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_____the damage is done, it will take many years for the farmland to recover. A. Until B. Unless C. Once D. Although
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| 4. 难度：中等 | |
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If you miss this chance, it may be years ____ you get another one. A. as B. before C. since D. after
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| 5. 难度：中等 | |
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We need to get to the root of the problem______ we can solve it. A. while B. after C. before D. as
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| 6. 难度：中等 | |
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I believe you will have a wonderful time here you get to know everyone else. A. though B. as if C. once D. so that
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| 7. 难度：中等 | |
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_________the students came from different countries, they got along quite well in the summer camp. A. While B. Unless C. Since D. Until
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| 8. 难度：中等 | |
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_____ he once felt like giving up, he now has the determination to push further and keep on going. A. Where B. As C. In case D. Now that
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| 9. 难度：中等 | |
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________ the job takes a significant amount of time, most students agree that the experience is worth it. A． If only B． After C． Although D． In case
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| 10. 难度：中等 | |
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_______ the forest park is far away, a lot of tourists visit it every year. A. As B. When C. Even though D. In case
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| 11. 难度：中等 | |
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_______ you start eating in a healthier way, weight control will become much easier. A. unless B. Although C. Before D. Once
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| 12. 难度：中等 | |
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I'll be out for some time. ______ anything important happens, call me up immediately. A. In case B. As if C. Even though D. Now that
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| 13. 难度：中等 | |
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Lessons can be learned to face the future, ________ history cannot be changed. A. though B. as C. since D. unless
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| 14. 难度：中等 | |
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The meaning of the word "nice' changed a few tines it finally came to include the sense "pleasant." A. before B. after C. since D. while
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| 15. 难度：中等 | |
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Cathy had quit her job when her son was born _______ she could stay home and raise her family. A. now that B. as if C. only if D. so that
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| 16. 难度：中等 | |
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It's not easy to change habits, ________ with awareness and self－control, it is possible. A．for B．or C．but D．so
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| 17. 难度：中等 | |
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I was glad to meet Jenny again, ________ I didn't want to spend all day with her. A. but B. and C．so D．or
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| 18. 难度：中等 | |
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Don't turn off the computer before closing all programs, ________ you could have problems. A. or B. and C. but D. so
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| 19. 难度：中等 | |
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I have heard a lot of good things about you I came back from abroad. A. since B. until C. before D. When
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| 20. 难度：中等 | |
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________ we have enough evidence, we can't win the case. A．Once B．As long as C．Unless D．Since
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| 21. 难度：中等 | |
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He is so busy. He cannot afford enough time with his son ________ he wants to. A．even if B．as if C．because D．before
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| 22. 难度：中等 | |
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________ small, the company has about 1，000 buyers in over 30 countries. A. As B. If C．Although D．Once
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| 23. 难度：中等 | |
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________ I have to give a speech, I get extremely nervous before I start. A. Whatever B. Whenever C. Whoever D. However
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| 24. 难度：中等 | |
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Mark needs to learn Chinese ________his company is opening a branch in Beijing. A. unless B. until C．although D. since
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| 25. 难度：中等 | |
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She says that she'll have to close the shop ________ business improves. A. if B. unless C. after D. when
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| 26. 难度：中等 | |
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In the global economy, a new drug for cancer, ________ it is discovered, will create many economic possibilities around the world. A．whatever B．whoever C．wherever D．whichever
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| 27. 难度：中等 | |
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I took my driving license with me on holiday, ________ I wanted to hire a car. A. in case B. even if C. ever since D. if only
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